Both Moxy and JB placed the original order the the A220-300 at essentially the very same time, and the same model. They also both firmed up the order at essentially the same time.

As to why? If JB wanted to disguise their intentions of growing faster in the future/accelerate growth until some later time, for whatever reason, this would be one way to secure early delivery slots without disclosing it early. As I said, this is one of my working theories. Or Moxy is JB's future West coast codeshare partner. I don't believe Moxy is what David has said it is.